Myelin

Myelin is an insulating layer, or sheath that forms around nerves, including those in the brain and spinal cord. It is made up of protein and fatty substances.

This myelin sheath allows electrical impulses to transmit quickly and efficiently along the nerve cells. If myelin is damaged, these impulses slow down. This can cause diseases such as multiple sclerosis.

Myelin and nerve structure

Myelin is the layer that forms around nerves. Its purpose is to speed the transmission of impulses along nerve cells.